The use of 29Si NMR to characterize the sol-gel synthesis of cordierite

被引：0
|
作者：
H. Jancke
B. Unger
R. Müller
机构：
[1] Federal Institute of Materials Research and Testing (BAM),
[2] Zweiggelände Berlin-Adlershof,undefined
[3] Rudower Chaussee 5,undefined
[4] D-12489 Berlin,undefined
[5] Germany,undefined
来源：
Fresenius' Journal of Analytical Chemistry | 1997年 / 357卷
关键词：
Hexagonal; Structure Unit; Cordierite; Powder Material; Ceramic Powder;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
 Cordierite powder was synthesized via different sol-gel procedures. The use of 29Si NMR spectra of all stages beginning from tetraethoxysilane (TEOS) up to final ceramic powder material is discussed. In the early stages of the sol-gel process all oligomeric structure units can be identified. Spectra of the higher condensed sols only allow the quantification of Qn-groups. MAS spectra of gels heated up to 750 °C show no fine structure to be evaluated. Spectra of samples heated to 1250 °C indicate a sluggish disorder-order transformation from hexagonal α-cordierite to orthorhombic cordierite.
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页码：514 / 516
页数：2
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